<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			*{
				margin: 0;
				padding: 0;
			}
			#right{
				width: 100%;
				overflow: hidden;
			}
			#right #input_box{
				display: table;
				width: 100%;
			}
			#right #input_box .btn{
				width: 30px;height: 30px;
				background: red;
				box-sizing: border-box;
				display: table-cell;
			}
			#right #input_box input{
				height: 30px;width: 100%;
				box-sizing: border-box;
				display: table-cell;
			}
			
		</style>
	</head>
	<body>
		<div id="right">
			<div id="input_box">
				<div class="btn"></div>
				<input type="text" name="" id="" value="" />
			</div>
		</div>
	</body>
</html>
